Condensed Financial Information of Registrant Condensed Financial Information of Registrant (Narratives) (Details) - USD ($)							12 Months Ended
		Jan. 12, 2015	Jan. 02, 2015	Feb. 13, 2014	Aug. 09, 2013	Jul. 02, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 03, 2014
Condensed Financial Statements, Captions [Line Items]
Proceeds from special purpose investment vehicles							$ 8,900,000	$ 6,800,000
Proceeds from dividends received							133,000,000	225,000,000	$ 120,000,000
Capital contributions to subsidiaries							90,125,000	30,125,000	$ 40,125,000
Loan maximum borrowing capacity						$ 200,000,000
Revolving credit facility term						5 years
Credit facility	[1]						150,000,000	150,000,000
Total borrowing guaranteed							20,000,000	$ 20,000,000
Revolving Credit Facility [Member]
Condensed Financial Statements, Captions [Line Items]
Loan maximum borrowing capacity						$ 200,000,000				$ 250,000,000
Revolving credit facility term						5 years
Credit facility							$ 150,000,000
Interest rate at period end							1.53%
Workmen's Auto Insurance Company [Member]
Condensed Financial Statements, Captions [Line Items]
Consideration paid in cash			$ 8,000,000
Amount held in escrow			$ 2,000,000
Term for escrow security payment			3 years
Capital contribution amount		$ 15,000,000
Mcc [Member]
Condensed Financial Statements, Captions [Line Items]
Credit facility							$ 120,000,000
Bank loan							20,000,000
Municipal bonds, fair value							180,000,000
Total borrowing guaranteed							140,000,000
Swap [Member] | FFL [Member]
Condensed Financial Statements, Captions [Line Items]
Notional amount							95,000,000
Swap agreement collateral							30,000,000
Term of swap agreement				1 year	3 years
Swap [Member] | FFL [Member] | LIBOR [Member]
Condensed Financial Statements, Captions [Line Items]
Basis spread on variable rate				1.40%	140000.00%
Swap [Member] | AFL [Member]
Condensed Financial Statements, Captions [Line Items]
Notional amount							124,000,000
Swap agreement collateral							$ 40,000,000
Swap [Member] | AFL [Member] | LIBOR [Member]
Condensed Financial Statements, Captions [Line Items]
Basis spread on variable rate				120000.00%	1.20%

[1] On July 2, 2013, the Company entered into an unsecured $200 million five-year revolving credit facility. The interest rate on borrowings under the credit facility is based on the Company's debt to total capital ratio and ranges from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is above 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is above 25%. Debt to capital ratio is expressed as a percentage of (i) consolidated debt to (ii) consolidated shareholders' equity plus consolidated debt. Effective December 3, 2014, the Company extended the maturity date of the unsecured credit facility from June 30, 2018 to December 3, 2019, and expanded the borrowing capacity from $200 million to $250 million. In 2015 and 2014, the interest rate was LIBOR plus 112.5 basis points on the $150 million of borrowings and 12.5 basis points on the undrawn portion of the credit facility. The interest rate was approximately 1.53% at December 31, 2015.